Attachment plug



June 9, 1925.

R. B. BENJAMIN AT'I'ACHMENT PLUG Filed Oct. 30, 1919 'mi .29 l

Patented June 9, 1925.

UNiTEn sta-Tes PATENT oF'FlcE.

REUBEN IB. BENJAMIN, OF CHCAGO, ILLINOIS, ASSIGNOB, T0 BENJAMIN ELECTRIC IVIANUFAGTURING OMPANY, U35' CI-IICGQ- ILLINOSp A CORPORATION OF IIJLI- ATTACI-IMEN'I' I'LUG.

Application filed ctober 30,1919; Serial No. 334,476.

To all 'witam t may concern:

Be it known that I, REUBEN BENJ- MIN, a citizen of the United States, residing at Chicago, in the count-57 of Cook and State of Illinois, have invented new and useful Iniproveinents in Attachinent Plugs, of which the following is a full, clear, concise, and exaot description, reference being had to the accoinpanying drawing:y fornling a part of this specification.

My 'invention pertains to attachment plugs, and has one of its objects, the pro- 'vision of a plug of a simple and durable construction, which may be placed upon the market at a low price.

lt is another object of niy invention to provide a simplified forin of plug having conductor gripping nieans for i'elieving the binding terminal fro-in strain.

A plug constructed in accoi'dance with niy invention is described, by way of er;- ample, in the following specification and shown in the aoco-n'ipanying drawing. It is to be understood', however, that changes may be made in the enihodiinent of niy invention which 1 have chosen to describev and show, without exceeding the scope of the invention, as defined in the appended claiins.

In the drawing:

Fig. 1 is a Vertical section taken through a plug' constructed in accordance with my invention, the section being taken on the line l-lof Fig. 4, looking` in the direction of the arrows;

F ig. 2 is a view similar to F ig. 1, the section being, however, taken on the line 2-2 of Fig. 11, looking in the direction of the a-rrows;

Fig. 3 is a view similar to Fig. 1, the section being, however, taken on the line 8-3 of Fig. 4;, looking in the direction of the arrows;

F ig. 4 is a plan view of the plug;

Fig. 5 is an inverted plan view of the insulating base which carries the contacts;

Fig.`6 is a plan view of theinsulating ring which serves as a hand-hold;

Fig. 7 is a detail perspective view of the insulating base which carries the contacts, and i Fig. 8 is a detail perspective view of the threaded shell contact.

.an inwardly extending flange 111 which en"- gages the shoulder at the point where the extension 11 projects 'from the base 10. The base 10 is provided with a rece-ss 15 underneath the flange 14 in which recess is located a nut 16,` such-nut receiving the binding screw 17 which extends through an opening 17 a in the flange 111, and is threaded into the nut 16. The base 10 is forined with,

a conductor-receiving passage 18 which extends therethrough between the axis and the periphery of the base, the upper end of this' passage opening near the binding screw 17, and registering with an opening 18a in the flange 14, so as to perinit the conductoi' readily to be brought into position for securing thereunder. In order to further position thethreaded Shell contact 12 on the insulating base 10', the fiange 14: of the threaded shell contact is provided with an inwardly extending projection 18b which registers with a corresponding depression 18c in the insulating base.

A screw 19 passes lo'ngitudinally through the base 10, such being provided with a washer 20 having a horizontal flange 21 which lies'flush with the head of the screw 19, resting upon the top of the extension 11. The base extension 11' is formed with a chaniber 22 which receives the llower parts of the washer 20 and the head of the screw 19. A conductor-receiving passage 23 is fornied in the base 10 between the axis and! the periphery thereof, suchv passage being disposed diainetricallyl opposite to the passage 18. The passage 23 opens into the chainber 22, and perinits a conductor to be led into the chamber 22 and secured therein beneath the washer 20. The head of the screw 19, together with the washer-flange 21, forms the center contact of the plug.

Jil.-

The screw 19 is threaded into an npwardly-extending stirrup 24 having downwardly-extending legs 25, which are imbeddedV in an; insu'lating ring'V 26,"whi'ch 'may be formed of hardl rubber or the lile. The stirrup 24 enters a correspondingly shaped SQ.. 19.,iS,..S, =r Wd into the ;stirrilp Q-hit firml7 draws the ring 26 against the lower side of the base 10, thus securing the parts. of the plug firmly together. By reason of the engagement of the stirrnp' 245 in the recess 27, relative rotation between the ring 26 and the base IO is efiectall prevented. The rilig V52,6 is' formed withv a ceh'tra'li apel;- tnr'e :'ZSith'r'oiigh whieh theV conduct'ors ma be passed to the binding terminals of the p'liig' At the top edge of the a'perture, the` ring 26 is formed with two small channels 29'an`dg30, faeingthe pass'ages 18V and 23: fes'p'e'ct'ively7 so toV facilitat'e the leadof the condu'ctors from the aperture 28 into the pasage's 18 and. w

`n' connect'ing up the' plug for use, the ring t'is separated fromthe base. 10 by loosening'thes'crew 19g.v Theconductiors are passed' through the ap'ertiire'28 of the ring 26';l and'one' of them is led through the pas-l` sagef IS aii'di'secii're'd 'beneaiththe' hinding scre'w-l 175 the other condiictor being led thi'ogh''the pass'ageaiidplaced' inpositio'n' heiieath the washer 20.

the screw 19 tight'ened dowri The effect of tight'ening the screw 1'9] is to vclanhp the coiiductor fir'ml'y beneat'lr the washer 20,,a11d also to'draw' the ring 26,' toward'the lower side of the base 10.' The reiilt of drawedagainst' thestrain being applied thereto;

n' win be not-ea am nie tii'readea Sjaeir contact 12 will be held' in place' permanently on' the insulatinghas'e 10;'wheii the base 10' is' scparat'ed' from'ythe insulating. ring ori thnnib' pleceG', maklng* the plug` easy t'o 'assemhle and Wire; as' there is .no

danger of the she-ll contact falling off;

This application is acoiitinu'ation' as to common subject claiined herein Vof Iv coi pendingf application Serial No; 766,557 ;fil'ed' May 9. 1913 1;' renewed Sept. 20, 1918; Serial' No.. 255,018; I.

lavingf thu'sJ described' my inventfion9 The stirrup: 24' i's' then inserted into the recess 27 and nas-11,024

what I claim as new and desire to secure by Letters Patent of the United States is: '1. An attachmentplug comprising an insufl'ati'ng po'rtion having a l non-circula'r recess in the lower side thereof, a Shell-contact associated with said insulating portion, a center .contact including aV pscrew: disposed longitndinally of said, insulating Vportion, and extending therethrough, and a second insulating portion having a metallic member secured thereto for receiving said screw, said member 'corresponding inshape to said recess and entering the latter and engaging the Walls thereof.' i x I 2. An attachmentl plug' compri'sing a shell coiitact,` a center contact including' a scre'w,` an insiilating portion receiving said. con'- tacts' and forined with conductor-receiving pass-ages, said! insiii'atiiig portio'n' having a non-circular recess in 'the lower side thereof, a secondl insiilriting poiftioii' having an' aperture therethrough for receivingthe conductors, said aperture dispo'sed so that its' edge grips the coiid'uctors contained in passages', a metallie member secured to said second named insulating portii'on,` for receiving said screw; said lmeniher correspondingin ,Shape to said: reces's and entering the lat'ter and engagiiig the walls thereof. A w i p i SL Anl attachinent plug co'mprising p aA slill contact, a center contact including a screw,`

an insul'atin'g porti'on receiving said contacts and formedl with condiictor-receiving passages, said insulating portion having' non-circular recess in 'the lower side there-V of', a second' insiilating port'ion having an aperture 'there't'hrough for receivinglthe conductors` said aperture being dispo'sed so that it's edge: grips' the conductors contained' in` said'pass'ages; and a nietallic stra'p foi' receiving said screw, eittendiiig upward from said' second' nanied insulat'ing por`tin 'and st'riaddliiigsaid' aperture, s'ai'd strapicorresponding in Shape' to i said recess: aiid enter? ingtlie latt'er and engaging the' Walls thereof.

4. An attachment plug comp'i sing'aiik insul'atingifA por'tion having a paiil of binding posts' thereoh, af ipai r of 'conductor-receiving" passages tfhereiii",' offset froiii' the 'ai-:is there'-- of, and leadinvj from said binding post'sa second insul'ating port'i'on having' an aXial con'duct'or-receiving opening therethrugln said opeiiing` coi'ninunicatiiig with both' of said passages, the edge of said openiiig' heing adjacenfl the inner edges of said passages''7 andmeaiisf for drawing said' porti'ons together to vc'l'amp the conducto'rs between said (-;agesl I ln witness wh reof, 1 have'hereunto siibs'crlbed my name.

REUBE B. BENJAMIN. 

